TestOffset.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.functions.Offset.LinearOffsetRange;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

/**
 * Tests for OFFSET function implementation
 */
final class TestOffset {

    /**
     * Excel's double to int conversion (for function 'OFFSET()') behaves more like Math.floor().
     * Note - negative values are not symmetrical
     * Fractional values are silently truncated.
     * Truncation is toward negative infinity.
     */
    @ParameterizedTest
    @CsvSource({
        "100.09, 100", "100.01, 100", "100.00, 100", "99.99, 99", "+2.01, +2",
        "+2.00, +2", "+1.99, +1", "+1.01, +1", "+1.00, +1", "+0.99,  0",
        "+0.01,  0", "0.00,  0","-0.01, -1", "-0.99, -1", "-1.00, -1",
        "-1.01, -2", "-1.99, -2", "-2.00, -2", "-2.01, -3"
    })
    void testDoubleConversion(double doubleVal, int expected) throws EvaluationException {
        assertEquals(expected, Offset.evaluateIntArg(new NumberEval(doubleVal), -1, -1));
    }

    @Test
    void testLinearOffsetRange() {
        LinearOffsetRange lor;

        lor = new LinearOffsetRange(3, 2);
        assertEquals(3, lor.getFirstIndex());
        assertEquals(4, lor.getLastIndex());
        lor = lor.normaliseAndTranslate(0); // expected no change
        assertEquals(3, lor.getFirstIndex());
        assertEquals(4, lor.getLastIndex());

        lor = lor.normaliseAndTranslate(5);
        assertEquals(8, lor.getFirstIndex());
        assertEquals(9, lor.getLastIndex());

        // negative length

        lor = new LinearOffsetRange(6, -4).normaliseAndTranslate(0);
        assertEquals(3, lor.getFirstIndex());
        assertEquals(6, lor.getLastIndex());


        // bounds checking
        lor = new LinearOffsetRange(0, 100);
        assertFalse(lor.isOutOfBounds(0, 16383));
        lor = lor.normaliseAndTranslate(16300);
        assertTrue(lor.isOutOfBounds(0, 16383));
        assertFalse(lor.isOutOfBounds(0, 65535));
    }

    @Test
    void testOffsetWithEmpty23Arguments() throws IOException {
        try (Workbook workbook = new HSSFWorkbook()) {
            Cell cell = workbook.createSheet().createRow(0).createCell(0);
            cell.setCellFormula("OFFSET(B1,,)");

            String value = "EXPECTED_VALUE";
            Cell valueCell = cell.getRow().createCell(1);
            valueCell.setCellValue(value);

            workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();

            assertEquals(CellType.STRING, cell.getCachedFormulaResultType());
            assertEquals(value, cell.getStringCellValue());
        }
    }
}